But not all Ontario beaches have lifeguards or updated safety signage, especially at the Great Lakes. "We tend to think of big waves and rip currents as being something that is associated with the ocean. "People are not aware that the Great Lakes can be just as dangerous and we tend to underestimate their power." LISTEN | Drowning prevention in the Great Lakes:Houser says one of the things that makes the Great Lakes more dangerous is their enormous size. Houser and his team have deployed a network of sensors at Kincardine's Station Beach to monitor water levels, waves, currents and pedestrian patterns.